Air heater



FIG. 1 is a front view showing the ornamental design of a first embodiment of an air heater according to the present invention;

FIG. 2 is a top view of the air heater of FIG. 1;

FIG. 3 is a bottom view of the air heater of FIG. 1;

FIG. 4 is a back view of the air heater of FIG. 1;

FIG. 5 is a perspective view of the air heater of FIG. 1;

FIG. 6 is a reverse perspective view of the air heater of FIG. 1;

FIG. 7 is a front view showing the ornamental design of a second embodiment of an air heater according to the present invention;

FIG. 8 is a top view of the air heater of FIG. 7;

FIG. 9 is a bottom view of the air heater of FIG. 7;

FIG. 10 is a back view of the air heater of FIG. 7;

FIG. 11 is a perspective view of the air heater of FIG. 7;

FIG. 12 is a reverse perspective view of the air heater of FIG. 7;

FIG. 13 is a front view showing the ornamental design of a third embodiment of an air heater according to the present invention;

FIG. 14 is a top view of the air heater of FIG. 13;

FIG. 15 is a bottom view of the air heater of FIG. 13;

FIG. 16 is a back view of the air heater of FIG. 13;

FIG. 17 is a perspective view of the air heater of FIG. 13; and,

FIG. 18 is a reverse perspective view of the air heater of FIG. 13. 

We claim, the ornamental design for an air heater, as shown. 